CODESYS to Neuron comm problem

Hi
I have a problem with running modbus communication between CODESYS and Neuron S103.
I performed the installation according to the instructions on the web CoDeSys. The screenshot shows an unipi_modbus_server error message.
I tested the last unipian image, and mervis OS image.
Please tell me where I'm making a mistake.

Here's a screenshot of the experiment with image unipian-neuron-os-2018-06-15-beta.zip
Previous text related to image unipi-neuron-mervis-os-2018-09-14_v1.7-beta.zip
The same procedure, the error (maybe) the same.